Chinese researchers from Tianjin University have developed a groundbreaking lithium metal battery with an energy density of 600 Wh/kg, potentially doubling the range of electric vehicles (EVs) compared to current models. This innovative battery could mitigate concerns about range anxiety for future EVs and enable advancements in electric aircraft. Key enhancements include a novel electrolyte design and the use of machine learning to optimize components, resulting in a battery that maintains high performance and safety, even under extreme conditions.
The battery, reportedly boasting about twice the density of Tesla’s highest-performing batteries (approximately 300 Wh/kg) and four times that of BYD’s Blade (150 Wh/kg), could allow electric vehicles to achieve significantly longer ranges while also reducing weight. This advancement not only enhances vehicle performance and efficiency but also opens avenues for other transport sectors, such as electric aviation.
A critical challenge with lithium metal batteries has been the electrolyte, which facilitates the movement of lithium ions. Traditional designs often struggle to balance high energy density, longevity over numerous charges, and safety—most notably, avoiding combustion or structural failure. The research team addressed these issues by altering the conventional “solvation structure,” allowing lithium ions to engage more flexibly with their surroundings, thereby improving battery performance.
Machine learning played a pivotal role in this development, assisting researchers in testing various lithium salts and solvent combinations to identify optimal mixes for the electrolyte. Additionally, the inclusion of fluorine has enhanced the electrolyte’s thermal stability, allowing the battery to function safely at temperatures as low as -60 °C without freezing, and it does not ignite under open flames or when punctured.
Results showed that the new battery exhibited stable performance even after 90 charge cycles, although this is fewer compared to the thousands expected in commercial-grade batteries. Tests conducted on drones with this battery demonstrated a flight time extension by a remarkable 2.8 times, and it successfully endured 25 full charge cycles without instability or degradation.
Currently, this battery design exists as a proof-of-concept and is not yet ready for mass production. However, the research team is optimistic that further development will address current EV challenges, specifically range anxiety. This progress marks a significant step in novel lithium metal battery chemistry by redefining interactions between lithium ions and electrolytes, bringing China closer to its ambitious “Made in China 2025” initiative on battery performance.
While early findings suggest promising advancements, including double energy density and robust safety features, the technology is still undergoing pilot production, with a current operational life of approximately 90 cycles proven. Scaling this technology could potentially revolutionize the EV landscape, akin to the transformation aviation experienced with the jet engine.
https://interestingengineering.com/energy/china-ev-lithium-battery-doubles-energy-density